Crossword puzzle clue "a billion years in astronomy"

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Answer
Clue
Relevancy
aeon
Clue
A billion years, in astronomy (Var.)
Definition
the largest division of geological time, composed of several eras, also EON
eon
Clue
One billion years, in astronomy
A billion years, in astronomy
Billion years, in astronomy
1 billion years, in astronomy
365 billion days, in astronomy
Years and years and years
Definition
a long period of time, also AEON
ages
Clue
Years and years and years
Definition
AGE, to grow old

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